Invisible-picture card.



O. F. MORSE.

HWISIBLE PICTURE CARD.

APPLIOATION FILED MAY 29, 1901'.

901,723, Pamnted 0011.20, 1908.

WITNESSES: INVE NTOR 'AT ORNEYI) ay/2. j 1244 I To all whom it concern:

UNITED SEDATES OFFICE.

CHARLES MORSE, OF NEW YORK, N'. Y;

' INVISIBLE-PICTURE CARD,

- Specification'of Letters Patent; ratnteaocaeo, 1908.

Application as m 29,1907. sriai No. 376,386.

Be it known that I, CHARLES Monsn, a

citizen of the United States of America, and a residen of the city, county, and State of vNew Yor have invented certain new and useful Improvements in- Invisible-Picture I Cards, of'w-hich the following is a specification, reference beinghad tiO'tl'lB accompanying drawings, forming a part thereof.

My invention relates toinvisiblepicture cards, and consists in a card containing thereon an invisible impression, and also provided with a developer which may be employed "for the purpose of developing such invisible impression whereby it may become visible. v

The developer is preferably soluble in water. By the simple act, then, of immersing the card as a whole in water, such def veloper willbe carried over to the invisible impression, and the same will be developed thereby without any further act upon the part of the operator. v

I conveniently produce the invisible impression upon the central portion of a card,

and surround this portion 'witha darker portion which contains the developer, said darker portion fol-mini; a mat or frame for the picture when deve oped.

In the drawing accompanying this application I have shown a card of this character, in which the central blank portion (1 forms a panel in which the invisible impression may be arranged, the outer darker portion 5 being the part which contains thedeveloper.

In the drawing: Figure 1 shows a card of this character before it has been immersed in water, and hence before the picture has been developed, andFig. 2is a face view of sucha card after such development.

Any suitable materials may be used for the invisible impression and for the developer,

and I make no clainr herein to any specific materials for this purpose. In a co-pending applicationlhave described an improve m nt in the art of invisible printing, which consists in employing yellow prussiatc of potash as one of the materials, and a material in which iron is included, such as chlorid of iron, 'for the other. Ifa cardhaving an invlsible impressionthereon, l

printed with yellow prussiate of potash and; having; a surrounding surface containing.

chlorid of iron, be, immersed in'water, the

effect will be that thechlorid of iron will becaused to immediately attack the yellow prussiate ofpotash, and the impressionwill be developed to a visible picture.

lVhat I claim L 1. A sheet or card containing on a per ti'on of its surface an invisibleimpression, and upon another portion of its surface a.

developer for such 'impression I 2. A sheet or card containing an invisible picture upon one portion of its surface, and upon another portion of its surface a developer therefor.

3. A sheet or cardcontaining an invisible ortion of its surface surrounding I pictureupon its surface, and a developer upon a the said invisible picture.

4. A sheet or card having a light central I portion having thereon an invisible picture, and a darker surrounding portion containing a'developer for the said picture. 5. A sheet or card containing on a portion, of its surface an invisible impression, and upon another portion of its surface a developer for such impression, said devel oper soluble in'water.

6. A. sheet or card containing an invisible a portion having thereon an invisible picture,

and a darker surrounding portion containing a developer therefor, said developer soluble in water.

' C. 1 MORSE. W itn esses D. How/urn HAYwoon', LYMAN S. ANDREWS, Jr. 

